All seem like very good ideas for the collection of short stories. I say go for it.

My second book is currently under way after a 2-3 month writers block. I had only written one page and it sat there for the longest time, then out of the blue I had a change in my mind for how things would progress.

In my head I had this idea of how the main character would gain super powers and I kept trying to write it but basically my mind didn't like the idea (if that makes sense). So essentially part of my mind was pushing for one idea and the other part was rejecting it.

2-3 months pass and a new idea formed that felt better, made more sense. So I began writing again.
I would suggest if anyone is having writers block to consider alternative routes the story can take instead of trying to force an idea into place.

Insanity - doing the same thing over and over again and expecting different results